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Question DetailsAsked on 1/30/2018

Why would I have no water coming from supply line into dishwasher but regular water preasure everywhere else?

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1 Answer


1) water line to dishwasher frozen up because it is enclosed in a cabinet or runs up against a very cold outside wall. If so, open cabinet or use hair dryer on low to thaw - beware a line may have split when it froze, so may start spraying when it thaws out, so know where the shutoff is before doing this.

2) shutoff valve has clogged up with sediment and/or corrosion products due to lack of use. If you shut it off, and CAREFULLY (with pan underneath to catch water) undo the line to the dishwasher, one of three things may happen, after you catch the very small amount of water comes out to relieve the pressure in the line plus typically a cup or two from water in the line itself. Undo line slowly to let pressure drop off - if it does not drop off very rapidly, then valve may not be shutting all the way (failed) so do not undo the tubing connection any further, and you need a plumber in that case.

a) when you turn the valve back on a touch (first turn off dishwasher and garbage disposal switches for safety, then use a rag to catch the water and make it drain down into catch pan rather than spray all over) it may not flow at all - indicating the valve is plugged up - or if in a very cold cabinet, that line may have frozen solid

b) water may spray out, clearing any blockage in the valve - or may come out but not to full flow because of a partial blockage remaining

c) water may come out clean, indicating no problem there and that the failure is likely at the dishwasher inlet valve

3) you actually have water to the dishwasher, but the controls or inlet valve have failed so it is not opening the valve to let the water into the dishwasher. You would have to (and this is a back-breaker ormeans taking the dishwasher out of its cave) turn off the shutoff valve on the tubing to the dishwasher, put catch pan under the dishwasher connection, and disconnect the hose. Have the power switch to the dishwasher off or cord unplugged when doing this because you may get a bit of water spraying around, plus there are exposed 110/120V connections under there which you could contact.

When you disconnect the hose a cup or two of water may flow out. Then (probably two people for this) hold the end of the tubing in a pan or pot, and turn the shutoff valve on - if water comes out fine, then problem is at the dishwasher. Assuming it has power to it (tries to start cycle or status lights come on), could be a control problem, a chewed wire underneath leading to the inlet valve, or failed inlet valve. Latter is easy to DIY replacement if at all mechanically minded, BUT commonly means disocnnecting and pulling the dishwasher out to work on it - not something many homeowners are up to.


For a repair of shutoff valve to the tubing Plumbing is your Search the List category - he can also do the check under the dishwasher for water getting to it. A problem with the dishwasher itself, including its inlet valve or controls, you are talking an Appliance Repair - Large tech (your Search the List category to find a well-rated and reviewed contractor for this work).

Be sure to first check the cost of a new replacement dishwasher (delivery and setup and old unit haul-away from a local store commonly $0-75 depending on whether unit is over about $400-500 or not), because you want to have a number in mind for replacement cost in case he comes back with a major repair cost - like an electronic control board replacement or such.

Normal replacement of the dishwasher flow valve typically about $75-200 (depending on whether he has the part in stock to bring with him on first visit), plus about $30-70 for an inlet valve.

Answered 2 years ago by LCD

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